In 2009 and 2010, trials were conducted at six maple sugarbushes to assess the efficacy of 70% isopropyl alcohol (IPA) in conjunction with vacuum for the sanitation of maple sap collection systems, in comparison with sodium hypochlorite solution at 600 ppm (SH) pushed with air in the system. The results obtained by ATP bioluminescence demonstrated a notable reduction in
internal surface contamination of the sap collection system when IPA was utilized, with a sustained effect observed and after a few months following the treatment, in accordance with the established procedure. A reduction in contamination was observed for all systems evaluated and all types of surfaces tested (mainlines, lateral lines, droplines and spouts). Nevertheless, the
performance of the SH was only observed following a brief period (two days) after the treatment. Following an extended period (several months), the systems treated with bleach solutions exhibited contamination levels that were nearly equivalent to those observed prior to treatment. This contrasts with the findings for IPA. Consequently, sanitation with IPA represents an
efficacious method for maintaining low contamination levels in the sap collection system. Further research will be conducted in order to ascertain whether this practice affects the quality of maple products and sap yield. As this IPA is flammable, it must be utilized and stored in accordance with the established safety standards. _{(4010054-FIN-0411)}